Chain mortising machine



Mar. 5, 1.929. c. D.v MCARTHUR CHAIN MQB'ISING MACHINE Filed May 29, 1928 2 Sheets-Sheet .IJ .rulllllllllll llllllllnxlllllllhuW l I l Mar. 5, 1929. c. D. MCARTHUR CHAIN MORTISING MACHINE Filed May 29, 1928 2 Sheets-Sheet 1,793,941 rA'iENr orFicii.

CHARLES D. MCARTHUR, DAYTON, OHIO.

CHAIN MORTISING MACHINE.

Application filed May 29,

The invention relates tor mortisin'g machilies of the chain saw type. It has for its principal objects, the provision of a machine which can be employed to produce an underout mortise; the provision of a machine which will. operate automatically to produce a mortise having the outerrportion straight and the inner portion undercut, and the provision of a machine of simple construction easily operated, which will cut inortises of the type specified rapidly and accurately. One embodiment of the invention is illustrated in the accompanying drawings, wherein: y v

Figure 1 is a side elevation of the complete machine with the parts in the'position occupied after a mortise has been out and preliminary to the cutting of another. Fig. 2 is a partial view of the machine showing the position of the parts at the. completion of the cut. Fig. 3 isa side elevation of the cutting element. Fig. 4 is a longitudinal section through the cutting element with the undercutting levers in closed position.

Fig. 5 is a section on ythe line V-V of Fig. 4. Y And Fig. 6 is a view similar to that shown in the lower part of Fig, 4, but with the undercutting levers in expanded position.

The cutting element, which is cut a mortise with a widened portion at its lower end, as indicated at Akin Fig. '1, is

shown in detail in Figs. 3 to Apair of Vnarrow cutting chains l and 2 are employed passing around the sprockets 3 and 4 at the upper end of the element and around the pairs of wheels 5, 5 and 6, 6 atA their lower ends. The sprockets are keyed to the shaft 7 journalled in the bearing 8, and driven as later described.A yThe wheels 5, 5 and 6, 6

are mounted for rotation in the leversy 9 and 10. The levers are pivoted upon pins 11 and 12 carried in the lower ends'of the arms 13 and 14 integral with the guide block 15,

5 suoli block being bolted to the frame of they machine in fixed relation with respecty to the bearing 8. The block .15 is provided on its sides with the guide ribs 16,116 (Fig. 5),

which fit between the pairs'of yside links of4 vthe chains 1 and 2. The block 15 is also provided with a slot in whichlitsl the shank 17 ofthe cani member whose vertical move- 'nient is employed to open and close the,

Y levers 9 and 10. The shank has at its lower coive the 19, 19, rwhich are screwed designed' to n 1928. Serial No. 281,503.

secured to the biock by the screws 21.y

`Then the cam member is in itsuppeimost position, as indicated in Fig. 4, the upper ends of thearnis 9 and 10 are separated,

their lower ends being` brought together, and

the tool will cut a slot 'with straight sides. When the cam member is moved downto the position of Fig. 6, the inclined endslS,

1.8 of the cam member force the upper ends ofthe levers toward each other, thus separating the lower ends of the levers and the cutting chains, so that aiiundercut is produced in. the mortise. In operation, the upper part of the mortise is out with the `levers in the rposition of Fig. 4, and automatic means then function to move Athe lshank 17 gradually downward as the cutting element moves downwardly, so that the chains 1 and 2`are gradually separated, thus 'producing the undercut lower portion of the mortise A.` j

. The apparatus preferably used for operating the mortising elements is shown in Figs. l and 2, whereiny 22is [the framework ofthe machine; 23 is the driving motor;v 24 is kthe centrifugal pump; 25 is the tool heady guided for vertical movement in the frame and car rying the mortising element; 2G is the work platen carrying the kmember 27 which has` -just been mortised; 28 is a cylinder carrying y the plunger 29 which'moves the head 25iup and down; 30 is a cylinder provided with a .plunger 31 `for raising and lowering the workplat'en g and 32 is still. another cylinder provided kwith av plunger 33 for clamping the work on the work platen. y

The pump 24 provides the pressure for operating the plungers 29, 31 and 33, suityablepiping connections with the usual three- ,wayy valves (not shown) being provided for connecting the ends of the cylinders carry- Vbeing. journalledin the collarsf'41, 42`and 43 l rigidv with.. the frame 22. The `head is moved up and down by the piston rod 44 connected at its lower end to the plunger 29,

CLI

2 messer and has journalled in its upper and lower ends respectively the transverse shait'ts Y and 45, the shaft 45 being driven from the vcrti cal shaft 36 by the gears 4G and 27, the lirst of which is splined on the shaft 3G. The shaft T is driven Ytrom the shaft l5 by a belt 4S passing` around pulleys on the tivo shafts.

The Work platen 26 is mounted or vertical movement on the frame 22, and is moved up and down by the plunger 8l operated by iluid pressure from the pump 24. The platen carries a iixed abutment Ael@ for engaging` one side of the work 2T, the other side oi" such Work being` engaged by a clamping plate rihe plate 5() is pivoted to the upper end of the lever 5l, which is lulcinmed at 52 to the platen 26. rEhe lower end ot the lever is moved in and out by the piston rod 53 connected to the plunger The downward movement of the shank 17 (Figs. 4l and 6) to open the arms 9 and l0 is secured by the cam plate 5l, pivoted in the tool head 25 ,at 55, and having a nose 56 which projects through the slot 5'? (Fig. 3) in the shank. The lower end ot the cam plate has a cam slot comprising the straight portion 58 ard the inclined portion 59, such slot being engaged by a pin GO carried by Ythe bracket Gl a itached to the machinera-me and, therefore, fixed relative to the head.

In operation, the parts, preliminary to the mortising operation to cut the slot A, are in the position shown in Fig. l, the motor 23 being started to secure the necessary pressure from J:he pump 24 and to rotate the shaft 7, `Which in turn drives the cutting chains l, 2 at a relatively high rate of speed. The head 25 is now caused to move` down by exhausting the Huid on the loiver side of the plunger 29 and admitting pressure on the upper side thereof. rlhis movement ear-- ries the cutting chains down against the edge of the Work 27. the cutting travel of the head, the levers'l) and l0 occupy the position shown in Fig. 4, and a straight sided slot is cut, thev pin 60, during this period, riding in the straight port-ion 58 (Fig. l) of the`slot in the cam plate, so that the plate is not moved around the pivot 55. When the inclined portion 59 of the slot is engaged by the pin, the lower end of the cam plate is swung to the lett, asA

indicated in Fig. 2, thus moving theA nose 56 of the plate downwa rd, so that the shank 17 is moved down. This cams the upper ends of the levers 9 and 10 toward each other, and separates the lower ends. The saw chains are thus spread apart,`cutting the undercut portion of the slot A. As the head 25 is moved upward to Withdraw the tool from the Work, a reverse movement of the parts is secured, the lower ends of the levers being moved back to the positionof Fig. 4, as the tool moves up, so that the cutting tool clears the mortise during the With- During the lirst pol-ion of drawing movement. The character of the mortise cut may be modified to suit requirements by substituting other plates having differently proportioned slots 58, 59.

What l claim is:

l. ln combination in a chain mortisin g inaehine, a pair` ot endless cutting chains arranged side by side, a frame in which the chains` are mounted, a pair of guide members around which the chains pass atene end the frame mounted tor movement ton Ward and i'ii'oineach other in a direction tn nsverse to the planes in unich the chains lie, and means 'for driving the chains.

2. ln combina-tion in a chain mortising machine, a pair of endless cutting chains arranged side by side, a frame in which the chains are guided, driung sprockets around which the chains at one end of the traine, a pair ot guide members around which the chains pass nivotally mounted at the other end oitn the trame so that such members may be separated or brought into parallelism, and means for driving the sprockets.

3. In cen'ibination in a chain mortising nziachine, a pair endless cutting chains araged, side by side, a tool head` mounted icr ieciproca" movement in Which the ,chains are in d, driving` sprockets carfried by the head around. which the chains pass, a. pair vof guide members carried by the 4head around which the chains also nass mounted for ovement toward and trom each other so s Lat the chains may be separated or brought into parallelism, and means etuated by the movement ot the head when moved inc-ne ldA c ier causing the guide e and for causing them members to sep to move towardr each other When moved in the reverse direction.

si. ln Acombination in a chain mortising machine, a pair of endless cutting chains arranged side by side, a tool head mounted" for. 'reciprocating movement in which the chains are mounted, driving sprockets carried by the head around which thechains` passg a pair of guide members carried by the head and each provided with a pair of" rollers around which the chains pass, such members ,being pivotally supported for movement toward and from each other, and

means actuated by the movement of the head in one direction 'for separating said" members and Yfor moving them toward each other when the head is moved in the reverse Alireciion.

5, ln combination in a chain mortising machine, a pair of endless cutting chains arranged side by side, a tool head mounted for reci )rocating movement in Which the chains are mounted, driving sprockets carried by the head around Which the chains pass, a pair of guide members carried by the head and eachv provided with a pair of rollers around. Which the chains pass, such members being pivotally supported for movement toward and from each other, cam meanscarried by the head for opening and closing said members, andV means fixed VWith respectJ to the head and cooperating With the cam means for causing said members to open and close as the head is moved up and down.

G. In combination in a chain mortising machine, a pair of endless cutting chains arranged side by side, a `trame in which the chains are guided, driving sprockets around which the chains pass at one end of the trame, .a pair 'of guide members around which the chains pass pivotally mounted at the other end of the frame so that such men'ihers .may be separated or brought into parallelism, means mounted for movement longitudinally of the 'fra-me for separating said members and moving them int-o parallelism, and means tor driving the, sprockets.

"7. ln combination in a chain 'mortising machine, a pair of endlesscutting chains arranged side by side, a frame in which the chains are mounted, a pair ot guide members around'which the chains pass at one end of the frame mounted tor movement toward and 'from each other in a direction transverse to the planes in which the chains lie, means mounted for movement .longitudinally of the kframe for separating said members and moving them into parallelism,

and means for driving the chains. 1

8u ln combination in a chain mortising machine, a pair; of endless cutting chains arrangedy side by side, a frame in which the chains are mounted, apair of guide members around which the chains pass at one end of the frame mounted for movement/toward' ot the framel provided With rollers around which the chains pass, means movable longitudinally of the -frame for separating and closing saidmembers, means operated by the downward movement of the `frame for moving said last means to separate said members as the frame moves dovvn, and means carried by the frame for driving the chains.

l0. ln' combination in a chain mortising machine, va frame mounted kfor vertical movement, a pair of endless cutting 'chains side by side in the frame, a Lpair of sepa-` rable guide members at ythe lovverL end of the frame provided With rollers around which the chains pass, means movable longitudinally ol' the frame for separating and closing said members, a cam member on the trame engaging said last means and operated by the downward Amovement of thev trame so as to move said last means to sep'- arate said members, and means 'carried b the frame for driving the chains.

In testimony whereof, I have hereunto' subscribed my name this 26th day of May, 1928. i v

omis; D. MCARTHUR. 

